The term composer not recognised

[vikdaguru]

composer : The term 'composer' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling
of the name, or if a path was included, verify that the path is correct and try again.
At line:1 char:1

• composer require phpmailer/phpmailer

•   + CategoryInfo          : ObjectNotFound: (composer:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException
  

[Synchro]

You need to install composer first, just like you install PHP to run PHPMailer too. It's nothing to do with PHPMailer otherwise.